Alternating Electric Fields for Pluripotent Stem Cell Elimination
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Solution Overview
Problem
Current methods for selectively removing residual pluripotent stem cells from pre-transplanted cells while sparing their differentiated progeny cells are inefficient and have significant disadvantages, such as high cost, variability, non-specific binding, and the use of ionizing radiation.
Innovation Solution
Exposing pluripotent stem cells to an alternating electric field with specific frequency and field strength to prevent or disrupt mitosis, kill, or reduce the viability of these cells, thereby controlling their growth and eliminating them from sites of unwanted development.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cytotoxic antibodies or specific antibody cell sorting are used to remove residual pluripotent stem cells, then selectivity is improved, but cost and device complexity increase significantly
Solution Approach 1:
The patent replaces complex biological systems (antibodies, genetic manipulation, radiation) with a simpler physical system - alternating electric fields. This substitution maintains the ability to selectively target and eliminate pluripotent stem cells while avoiding the complexity, cost, and side effects associated with biological reagents and procedures
Solution Approach 2:
The patent utilizes parameter changes in the alternating electric field (frequency, amplitude, pulse duration) to achieve selective elimination of pluripotent stem cells. By optimizing these electrical parameters, the method achieves high selectivity without requiring complex delivery systems or reagents
2Reliability
If genetic manipulation with suicide genes is used to eliminate residual pluripotent stem cells, then selectivity is improved, but time consumption and procedure complexity increase
Solution Approach 1:
The alternating electric field method eliminates the need for preliminary genetic manipulation steps. Pluripotent stem cells can be directly targeted and eliminated through electrical field exposure without requiring prior introduction of suicide genes or other genetic modifications, thereby significantly reducing procedure time
Solution Approach 2:
The patent replaces time-consuming genetic manipulation procedures with a direct physical intervention using alternating electric fields, achieving rapid and selective cell elimination without the multi-step processes required for genetic engineering
3Reliability
If radiation therapy is used to remove residual pluripotent stem cells, then elimination effectiveness is improved, but harmful effects increase due to ionizing radiation
Solution Approach 1:
The patent converts the previously harmful effect of uncontrolled pluripotent stem cell proliferation into a beneficial target. By exploiting the unique electrophysiological properties of dividing cells, the alternating electric field selectively eliminates harmful residual stem cells while sparing differentiated cells, effectively converting the problem of cell proliferation into a solution mechanism
Solution Approach 2:
The patent replaces ionizing radiation with alternating electric fields as the elimination mechanism. This substitution maintains effectiveness in removing residual pluripotent stem cells while eliminating the harmful side effects of radiation exposure to surrounding healthy tissues
4Reliability
If high intensity electric fields are used to eliminate pluripotent stem cells, then elimination effectiveness is improved, but viability of differentiated progeny cells decreases
Solution Approach 1:
The patent applies partial action by using alternating electric fields at intensities and frequencies specifically optimized to affect dividing pluripotent stem cells while being sub-threshold for differentiated cells. This partial application of electrical stress achieves selective elimination without excessive damage to the broader cell population
Solution Approach 2:
The use of alternating electric fields with specific frequencies creates periodic action that selectively disrupts mitotic processes in pluripotent stem cells. The periodic nature of the field allows differentiation between dividing and non-dividing cells, eliminating the former while preserving the latter through frequency-selective targeting
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method effectively prevents or disrupts mitosis, kills, or reduces the viability of pluripotent stem cells, offering a less invasive and more efficient approach compared to existing methods for managing disorders like cancer or ectopic pregnancies.
Implementation Method 1
TTFields are typically low intensity (e.g., 1-3 V/cm) alternating electric fields within the intermediate frequency range (100-300 kHz). TTFields can deliver alternating electric fields through non-invasive transducer arrays across the anatomical region of a tumor. TTFields have been established as an anti-mitotic cancer treatment modality because they interfere with proper micro-tubule assembly during metaphase
Implementation Method 2
exposing the pluripotent stem cells to an alternating electric field for a period of time, the alternating electric field having a frequency and field strength, wherein the frequency and field strength of the alternating electric field kills the pluripotent stem cells
Data Source
AI summary
Disclosed are methods and compositions for preventing or disrupting mitosis of pluripotent stem cells, killing pluripotent stem cells, preventing or disrupting division of pluripotent stem cells, reducing the viability of pluripotent stem cells, slowing the progression or differentiation of pluripotent stem cells, and treating an ectopic pregnancy.